Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The unsprung mass in lighter
The assembly is slightly more complicated in design
Non vertical external forces are supported by the suspension arms
The vertical size of the suspension can be made more compact

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to have more flexibility in design
Large changes in load make it necessary to have a large suspension stroke
It is desired to improve tyre to ground contact characteristics
It is desired to reduce the unsprung mass

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced by the passage of a spark
Ignition induced to supplement the process of normal combustion
Automatic ignition of the charge at the end of compression
Ignition of the charge before the passage of flame front

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